DHCP Conflict 5610

[gknight1]

I have never experienced this on an IPO. I have seen this on CM, but their IT guys would change something in DHCP and it would start working.

 

[puregold]

Are you saying you have an IPO dishing out duplicate DHCP?

I dont understand the question.

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[ProviderReborn]

Is it the IPO dishing out DHCP?

ACA - IP Office Implement
ACA - IP Telephony
CCENT - Cisco ICND1
CCNA - Working towards.

 

[gknight1]

sorry, no the DHCP server is 2003. There are 5 ip phones, but only one of them is giving me this problem. on the phone it displays DHCP Conflict

 

[tlpeter]

Leasetime is too low
Avaya recommend to set the lease time as high as possible


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ACS - Implement IP Office
ACA - Voice Services Management
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[Bas1234]

Did you try a Hold "reset"(73738)# #

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It works! Now if only I could remember what I did...
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[techair]

Give the phone a static addres and make sure its a free ip addres if this is working then you now the dhcp server is giving the phone a ip addres thats already in use on the network.you can also connect the phone on a hub but you gonna need a poweradapter for it.And then check with wireshark how the string looks like from the dhcp server

 

[gknight1]

tlpeter- what would raising the Lease time have to do with anything? right now it is at 8 days, what would you recomend putting it at?

bas1234- yes, no affect

techair-statically addressing it works with no problems. thats how i left it this morning becuase i didnt have time to look at it.

i had 2 ip phones for a year and nothing like this came up, i added 3 phones Friday and this happened this morning.

 

[Bas1234]

Did you try to stop/start the dchp service on the Server?

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It works! Now if only I could remember what I did...
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[Westi]

I wild thought of me, but if there is a conflict then it should be possible to ping the ip address if the phone gets unplugged giving that you can read the IP address out. Or if you can't then scan the whole network and then you can see what is on what IP address, do it with the phone in and again with the phone unplugged.
Or check the DHCP log on the server I would need the IT guy for that though)

Joe W.

FHandw.
ACA
ACS

 

[Bas1234]

Also check the DHCP server lease, try with wireshark to see what ip adress your server is giving out, then delete the lease of the same ip adress in the server.

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It works! Now if only I could remember what I did...
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[techair]

I would check your dhcp server i think he is giving the phones an ip-addres thats already in use.is the dhcp server in your control or in the customers control.If its in customers control than yoy can use wireshark to prove the problem is in the dhcp serve.Look for any bootp entries in wireshark

 

[gknight1]

i think i found the problem... we just moved, which resulted in someone plugging in my lab server to our network!

 

[gknight1]

yes that was the problem. I unplugged the server and what do you know, there was only one server giving out an address so it knew which one to pull from. sorry for the waste of time.